Nike took a trip "Back to the Future" with the limited-edition release of the movie-famous Nike Mag shoe. Made famous by Michael J. Fox in "Back to the Future Part 2" nearly 30 years ago, only 89 pairs of the shoes will be available in the U.S. and Canada via a lottery running from Oct. 4 through Oct. 11.

Similar to Marty McFly's pair, the shoes feature a system that automatically tightens and loosens on its own depending on the wearer's feet.

You can enter the lottery to win a pair of Nike Mags by donating $10 to the Michael J. Fox Foundation (click here) or via the Nike+ App. There is no limit on how many entries can be purchased.